The Use of Transcutaneous Electrical Nerve Stimulation (TENS) for Chronic Pain of Predominantly Peripheral Neuropathic Origin

The aim of this study is to investigate the effectiveness of TENS in addition to routine care in patients with chronic pain of predominantly neuropathic origin, compared to treatment with routine care alone.\" Hypothesis: An eventually neuropathic pain component is needed to be identified and alleviated in chronic pain patients to improve the quality of rehabilitation. 0-hypothesis: * TENS is not better than than placebo, medication or standard rehabilitation program. * A neuropathic pain component does not demand special considerations in rehabilitation of chronic pain patients.